Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the full transparency burden. It states the core parse behavior and implies a read-only operation, but it does not disclose behavior for invalid or non-GitHub URLs, nor does it clarify that only the url parameter is meaningful while other accepted properties are discarded – though the schema partially covers this.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single sentence with no filler and the key scoping information ('GitHub URL') is front-loaded. Every word contributes to understanding what the tool does.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With 9 optional parameters, no annotations, and no output schema, the description is somewhat thin for full self-sufficiency. An agent can infer likely usage from the schema's per-field notes, but the description alone does not state output format, failure behavior, or which parameters are ignored.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so every parameter already has a description; the tool description adds little beyond that. It ties the tool to the url parameter but does not explain how the many optional fields relate or which ones are irrelevant to this specific shape check.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description says 'Parse owner and repo from a GitHub URL' – a specific verb, resource, and output. It clearly distinguishes this tool from sibling URL-related tools like normalize-url and figma-url-shape by naming the GitHub domain and the extracted components.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The phrase 'from a GitHub URL' implies the intended input condition, but the description gives no explicit guidance about when to choose this tool over alternatives such as normalize-url or domain-shape. There are no stated exclusions or sibling routing cues.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.